Custom Post Type Not Displaying Featured Image

I’ve created a custom post type associations

function create_associations_post_type() {
  register_post_type( 'associations',
    array('labels' => array('name' => __( 'Associations' ), 'singular_name' => __( 'Association' )), 'public' => true, 'has_archive' => true));
} add_action( 'init', 'create_associations_post_type' );

and added theme support for the custom type and posts

function cse_setup() {
  add_theme_support('post-thumbnails', array('post', 'associations'));
} add_action( 'after_setup_theme', 'cse_setup' );

but featured images are only appearing in post type not associations. Does anyone know why or what I’m missing?